<span>Altruism is a selfless behavior so the animal would behave that way because it's intention is to put others before itself.
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Nitrogen fixation, N2 --> NH3+, is not something that plants to by themselves but some plants have bacteria that does this. I believe that pea plants have these, but I'm not 100% sure.
Answer: alarm and resistance
The exhaustion stage of stress originates from <span>the first two stages of the cycle of stress, the alarm resistance. tress, </span>and<span>Once alarm ( where the body system is flooded with adrenaline) is ended, resistance sets in and finally, exhaustion takes over when the body runs out of energy.</span>
The organisms in a pond and the physical factors <span>influencing them best describe "an ecosystem" since this is a self-contained environment will multiple organisms. </span>
